/*
 * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
 *
 * This program is free software: you can use, redistribute, and/or modify
 * it under the terms of the GNU Affero General Public License, version 3
 * or later ("AGPL"), as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef _TD_LIBS_SYNC_INT_H
#define _TD_LIBS_SYNC_INT_H

#ifdef __cplusplus
extern "C" {
#endif

#include "sync.h"
#include "syncTools.h"
#include "tlog.h"
#include "ttimer.h"

// clang-format off
#define sFatal(...) do { if (sDebugFlag & DEBUG_FATAL) { taosPrintLog("SYN FATAL ", DEBUG_FATAL, 255, __VA_ARGS__); }}     while(0)
#define sError(...) do { if (sDebugFlag & DEBUG_ERROR) { taosPrintLog("SYN ERROR ", DEBUG_ERROR, 255, __VA_ARGS__); }}     while(0)
#define sWarn(...)  do { if (sDebugFlag & DEBUG_WARN)  { taosPrintLog("SYN WARN ", DEBUG_WARN, 255, __VA_ARGS__); }}       while(0)
#define sInfo(...)  do { if (sDebugFlag & DEBUG_INFO)  { taosPrintLog("SYN ", DEBUG_INFO, 255, __VA_ARGS__); }}            while(0)
#define sDebug(...) do { if (sDebugFlag & DEBUG_DEBUG) { taosPrintLog("SYN ", DEBUG_DEBUG, sDebugFlag, __VA_ARGS__); }}    while(0)
#define sTrace(...) do { if (sDebugFlag & DEBUG_TRACE) { taosPrintLog("SYN ", DEBUG_TRACE, sDebugFlag, __VA_ARGS__); }}    while(0)
#define sFatalLong(...) do { if (sDebugFlag & DEBUG_FATAL) { taosPrintLongString("SYN FATAL ", DEBUG_FATAL, 255, __VA_ARGS__); }}     while(0)
#define sErrorLong(...) do { if (sDebugFlag & DEBUG_ERROR) { taosPrintLongString("SYN ERROR ", DEBUG_ERROR, 255, __VA_ARGS__); }}     while(0)
#define sWarnLong(...)  do { if (sDebugFlag & DEBUG_WARN)  { taosPrintLongString("SYN WARN ", DEBUG_WARN, 255, __VA_ARGS__); }}       while(0)
#define sInfoLong(...)  do { if (sDebugFlag & DEBUG_INFO)  { taosPrintLongString("SYN ", DEBUG_INFO, 255, __VA_ARGS__); }}            while(0)
#define sDebugLong(...) do { if (sDebugFlag & DEBUG_DEBUG) { taosPrintLongString("SYN ", DEBUG_DEBUG, sDebugFlag, __VA_ARGS__); }}    while(0)
#define sTraceLong(...) do { if (sDebugFlag & DEBUG_TRACE) { taosPrintLongString("SYN ", DEBUG_TRACE, sDebugFlag, __VA_ARGS__); }}    while(0)
// clang-format on

typedef struct SyncTimeout            SyncTimeout;
typedef struct SyncClientRequest      SyncClientRequest;
typedef struct SyncPing               SyncPing;
typedef struct SyncPingReply          SyncPingReply;
typedef struct SyncRequestVote        SyncRequestVote;
typedef struct SyncRequestVoteReply   SyncRequestVoteReply;
typedef struct SyncAppendEntries      SyncAppendEntries;
typedef struct SyncAppendEntriesReply SyncAppendEntriesReply;
typedef struct SSyncEnv               SSyncEnv;
typedef struct SRaftStore             SRaftStore;
typedef struct SVotesGranted          SVotesGranted;
typedef struct SVotesRespond          SVotesRespond;
typedef struct SSyncIndexMgr          SSyncIndexMgr;
typedef struct SRaftCfg               SRaftCfg;
typedef struct SSyncRespMgr           SSyncRespMgr;
typedef struct SSyncSnapshotSender    SSyncSnapshotSender;
typedef struct SSyncSnapshotReceiver  SSyncSnapshotReceiver;

extern bool gRaftDetailLog;

typedef struct SSyncNode {
  // init by SSyncInfo
  SyncGroupId vgId;
  SRaftCfg*   pRaftCfg;
  char        path[TSDB_FILENAME_LEN];
  char        raftStorePath[TSDB_FILENAME_LEN * 2];
  char        configPath[TSDB_FILENAME_LEN * 2];

  // sync io
  SWal*         pWal;
  const SMsgCb* msgcb;
  int32_t (*FpSendMsg)(const SEpSet* pEpSet, SRpcMsg* pMsg);
  int32_t (*FpEqMsg)(const SMsgCb* msgcb, SRpcMsg* pMsg);

  // init internal
  SNodeInfo myNodeInfo;
  SRaftId   myRaftId;

  int32_t   peersNum;
  SNodeInfo peersNodeInfo[TSDB_MAX_REPLICA];
  SRaftId   peersId[TSDB_MAX_REPLICA];

  int32_t replicaNum;
  SRaftId replicasId[TSDB_MAX_REPLICA];

  // raft algorithm
  SSyncFSM* pFsm;
  int32_t   quorum;
  SRaftId   leaderCache;

  // life cycle
  int64_t rid;

  // tla+ server vars
  ESyncState  state;
  SRaftStore* pRaftStore;

  // tla+ candidate vars
  SVotesGranted* pVotesGranted;
  SVotesRespond* pVotesRespond;

  // tla+ leader vars
  SSyncIndexMgr* pNextIndex;
  SSyncIndexMgr* pMatchIndex;

  // tla+ log vars
  SSyncLogStore* pLogStore;
  SyncIndex      commitIndex;

  // timer ms init
  int32_t pingBaseLine;
  int32_t electBaseLine;
  int32_t hbBaseLine;

  // ping timer
  tmr_h             pPingTimer;
  int32_t           pingTimerMS;
  uint64_t          pingTimerLogicClock;
  uint64_t          pingTimerLogicClockUser;
  TAOS_TMR_CALLBACK FpPingTimerCB;  // Timer Fp
  uint64_t          pingTimerCounter;

  // elect timer
  tmr_h             pElectTimer;
  int32_t           electTimerMS;
  uint64_t          electTimerLogicClock;
  uint64_t          electTimerLogicClockUser;
  TAOS_TMR_CALLBACK FpElectTimerCB;  // Timer Fp
  uint64_t          electTimerCounter;

  // heartbeat timer
  tmr_h             pHeartbeatTimer;
  int32_t           heartbeatTimerMS;
  uint64_t          heartbeatTimerLogicClock;
  uint64_t          heartbeatTimerLogicClockUser;
  TAOS_TMR_CALLBACK FpHeartbeatTimerCB;  // Timer Fp
  uint64_t          heartbeatTimerCounter;

  // callback
  FpOnPingCb               FpOnPing;
  FpOnPingReplyCb          FpOnPingReply;
  FpOnClientRequestCb      FpOnClientRequest;
  FpOnTimeoutCb            FpOnTimeout;
  FpOnRequestVoteCb        FpOnRequestVote;
  FpOnRequestVoteReplyCb   FpOnRequestVoteReply;
  FpOnAppendEntriesCb      FpOnAppendEntries;
  FpOnAppendEntriesReplyCb FpOnAppendEntriesReply;
  FpOnSnapshotSendCb       FpOnSnapshotSend;
  FpOnSnapshotRspCb        FpOnSnapshotRsp;

  // tools
  SSyncRespMgr* pSyncRespMgr;

  // restore state
  bool restoreFinish;
  // SSnapshot*             pSnapshot;
  SSyncSnapshotSender*   senders[TSDB_MAX_REPLICA];
  SSyncSnapshotReceiver* pNewNodeReceiver;

  // is config changing
  bool changing;

} SSyncNode;

// open/close --------------
SSyncNode* syncNodeOpen(const SSyncInfo* pSyncInfo);
void       syncNodeStart(SSyncNode* pSyncNode);
void       syncNodeStartStandBy(SSyncNode* pSyncNode);
void       syncNodeClose(SSyncNode* pSyncNode);
int32_t    syncNodePropose(SSyncNode* pSyncNode, SRpcMsg* pMsg, bool isWeak);
int32_t    syncNodeProposeBatch(SSyncNode* pSyncNode, SRpcMsg* pMsgArr, bool* pIsWeakArr, int32_t arrSize);

// option
bool          syncNodeSnapshotEnable(SSyncNode* pSyncNode);
ESyncStrategy syncNodeStrategy(SSyncNode* pSyncNode);
SyncIndex     syncNodeGetSnapshotConfigIndex(SSyncNode* pSyncNode, SyncIndex snapshotLastApplyIndex);

// ping --------------
int32_t syncNodePing(SSyncNode* pSyncNode, const SRaftId* destRaftId, SyncPing* pMsg);
int32_t syncNodePingSelf(SSyncNode* pSyncNode);
int32_t syncNodePingPeers(SSyncNode* pSyncNode);
int32_t syncNodePingAll(SSyncNode* pSyncNode);

// timer control --------------
int32_t syncNodeStartPingTimer(SSyncNode* pSyncNode);
int32_t syncNodeStopPingTimer(SSyncNode* pSyncNode);
int32_t syncNodeStartElectTimer(SSyncNode* pSyncNode, int32_t ms);
int32_t syncNodeStopElectTimer(SSyncNode* pSyncNode);
int32_t syncNodeRestartElectTimer(SSyncNode* pSyncNode, int32_t ms);
int32_t syncNodeResetElectTimer(SSyncNode* pSyncNode);
int32_t syncNodeStartHeartbeatTimer(SSyncNode* pSyncNode);
int32_t syncNodeStopHeartbeatTimer(SSyncNode* pSyncNode);
int32_t syncNodeRestartHeartbeatTimer(SSyncNode* pSyncNode);

// utils --------------
int32_t syncNodeSendMsgById(const SRaftId* destRaftId, SSyncNode* pSyncNode, SRpcMsg* pMsg);
int32_t syncNodeSendMsgByInfo(const SNodeInfo* nodeInfo, SSyncNode* pSyncNode, SRpcMsg* pMsg);
cJSON*  syncNode2Json(const SSyncNode* pSyncNode);
char*   syncNode2Str(const SSyncNode* pSyncNode);
void    syncNodeEventLog(const SSyncNode* pSyncNode, char* str);
void    syncNodeErrorLog(const SSyncNode* pSyncNode, char* str);
char*   syncNode2SimpleStr(const SSyncNode* pSyncNode);
bool    syncNodeInConfig(SSyncNode* pSyncNode, const SSyncCfg* config);
void    syncNodeDoConfigChange(SSyncNode* pSyncNode, SSyncCfg* newConfig, SyncIndex lastConfigChangeIndex);

SSyncNode* syncNodeAcquire(int64_t rid);
void       syncNodeRelease(SSyncNode* pNode);

// raft state change --------------
void syncNodeUpdateTerm(SSyncNode* pSyncNode, SyncTerm term);
void syncNodeBecomeFollower(SSyncNode* pSyncNode, const char* debugStr);
void syncNodeBecomeLeader(SSyncNode* pSyncNode, const char* debugStr);

void syncNodeCandidate2Leader(SSyncNode* pSyncNode);
void syncNodeFollower2Candidate(SSyncNode* pSyncNode);
void syncNodeLeader2Follower(SSyncNode* pSyncNode);
void syncNodeCandidate2Follower(SSyncNode* pSyncNode);

// raft vote --------------
void syncNodeVoteForTerm(SSyncNode* pSyncNode, SyncTerm term, SRaftId* pRaftId);
void syncNodeVoteForSelf(SSyncNode* pSyncNode);

// snapshot --------------
bool syncNodeHasSnapshot(SSyncNode* pSyncNode);
void syncNodeMaybeUpdateCommitBySnapshot(SSyncNode* pSyncNode);

SyncIndex syncNodeGetLastIndex(SSyncNode* pSyncNode);
SyncTerm  syncNodeGetLastTerm(SSyncNode* pSyncNode);
int32_t   syncNodeGetLastIndexTerm(SSyncNode* pSyncNode, SyncIndex* pLastIndex, SyncTerm* pLastTerm);

SyncIndex syncNodeSyncStartIndex(SSyncNode* pSyncNode);

SyncIndex syncNodeGetPreIndex(SSyncNode* pSyncNode, SyncIndex index);
SyncTerm  syncNodeGetPreTerm(SSyncNode* pSyncNode, SyncIndex index);
int32_t   syncNodeGetPreIndexTerm(SSyncNode* pSyncNode, SyncIndex index, SyncIndex* pPreIndex, SyncTerm* pPreTerm);

bool    syncNodeIsOptimizedOneReplica(SSyncNode* ths, SRpcMsg* pMsg);
int32_t syncNodeCommit(SSyncNode* ths, SyncIndex beginIndex, SyncIndex endIndex, uint64_t flag);

int32_t syncNodeUpdateNewConfigIndex(SSyncNode* ths, SSyncCfg* pNewCfg);

bool                 syncNodeInRaftGroup(SSyncNode* ths, SRaftId* pRaftId);
SSyncSnapshotSender* syncNodeGetSnapshotSender(SSyncNode* ths, SRaftId* pDestId);

int32_t syncGetSnapshotMeta(int64_t rid, struct SSnapshotMeta* sMeta);
int32_t syncGetSnapshotMetaByIndex(int64_t rid, SyncIndex snapshotIndex, struct SSnapshotMeta* sMeta);

void syncStartNormal(int64_t rid);
void syncStartStandBy(int64_t rid);

bool syncNodeCanChange(SSyncNode* pSyncNode);
bool syncNodeCheckNewConfig(SSyncNode* pSyncNode, const SSyncCfg* pNewCfg);

int32_t syncNodeLeaderTransfer(SSyncNode* pSyncNode);
int32_t syncNodeLeaderTransferTo(SSyncNode* pSyncNode, SNodeInfo newLeader);
int32_t syncDoLeaderTransfer(SSyncNode* ths, SRpcMsg* pRpcMsg, SSyncRaftEntry* pEntry);

// for debug --------------
void syncNodePrint(SSyncNode* pObj);
void syncNodePrint2(char* s, SSyncNode* pObj);
void syncNodeLog(SSyncNode* pObj);
void syncNodeLog2(char* s, SSyncNode* pObj);
void syncNodeLog3(char* s, SSyncNode* pObj);

#ifdef __cplusplus
}
#endif

#endif /*_TD_LIBS_SYNC_INT_H*/
